Part of 223/127 is supposed to become I-73. So there would be no need to change 75's route or designation. Most people will just take that when its finished anyways.
[[https://en.wikipedia.org/wiki/Interstate_73)
From 1999 MI is saying no to 73, but since its a federal highway approved by congress, it will happen regardless. Just time. In the mean time MDOT reinvested into upgrades and safety improvements.
"Ohio and Michigan both abandoned further environmental studies on their portions of I-73 in 99'. It is important to note that most of the I-73 corridor in both of these states follows existing freeways or highways scheduled to be upgraded to freeways under plans that predate I-73."
Now what we really need to see is 275 finished to 75, but with the addition of Martin Parkway, its most likely never happening now.
Another highway I'd like to see finished is Davison. Just connect the damn thing to 96. From there idk, I just know it will take a lot of unneeded traffic out of downtown for people trying to get to the east side.
edit:
As recent as 2010:
"Alan Clemmons announced that Interstate 75 had been adopted into the association. Clemmons said since I-75 lies within the I-73/74 corridor, and given its excitement in Michigan and Ohio, its inclusion into the I-73/74 Association is a "perfect fit" and helps reenergize allies in those states."
And as recent as 2017:
US Army Corps of Engineer issues permit to begin Construction of I-73
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